步骤3：执行器附件选型
　　Step 3: Actuator Accessory Selection

　　可为电动执行器提供高级执行器附件（参阅选型表7），也可为气动执行器提供高级执行器附件（参阅表8和9）。执行器附属备选件作为执行机构阀门的独立附属部件型号分别选型和订购。如果订购附属备选件，则确保将后缀“-A”加在所选择的、按照步骤1和2配置的执行器阀门组件包型号末端，并指定附件与阀门组件包一起组装。
　　Premium actuator accessories are available for both Electric actuators (Selection Table 7) and Pneumatic actuators (Selection Table 8 and 9). Actuator accessory options are selected and ordered separately as individual Accessory part numbers for the actuated valve. If accessory options are to be ordered, be sure the suffix, "-A", was added to the end of the selected Actuated Valve Package part number configured in Step 1 & 2 to designate that the accessories are assembled with the valve package.

　　对于所订购的每个附件，要使用各自的型号。从每个附件的选型表中选择所需要的附件型号。
　　A separate part number is used for each accessory ordered. Select the desired Accessory Part Number from the selection tables for each accessory.

　　例子：一个电动执行机构阀门需要配置一个加热器和温度调节装置，一个单刀双掷限位开关和一个0~5伏直流电信号定位器主板。从表7，下列附件型号应该与执行机构阀门组件包一起订购。
　　Example: An electric actuated valve is desired with a heater and thermostat, an SPDT limit switch set and a 0-5 VDC signal positioner board. From Table 7, the following Accessory part numbers should be ordered with the actuated valve package:

　　请联系美国斯毕尔公司了解附件选型表中没有列出的但又需要的任何附件。
　　Contact Spears® for any desired accessories for functions not specified in the Accessory Selection Tables.

　　选型表7：高级电动执行器附件：
　　Selection Table 7: Premium Electric Actuator Accessories